I’ve been working on my CCIE for a few months. I utilize a Cisco 2511 to connect to my lab remotely. I’ve found the following to be useful when going through mockup labs.

Exit a command (ping, traceroute, etc)
press “ctrl+shift+6″ twice consecutively

Remove all routing configuration
(config)# no ip routing
(config)# ip routing

Erase and reload all routers
You must have an active session from the 2511 (use # “show session” to verify )

send *
{enter}
wr erase
no
reload
{enter}

I’ll add more things as i think of them.